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  1. Trailer Brakes
  2. Dexter
  3. 7200 lbs Axle
  4. Electric Drum Brakes
  5. 12-1/4 x 2-1/2 Inch Drum
  6. Standard Grade
Dexter Electric Trailer Brakes - Parking Brake Ready - 12-1/4" - Left/Right Hand - 7.2K

Dexter Electric Trailer Brakes - Parking Brake Ready - 12-1/4" - Left/Right Hand - 7.2K

Item # 23-428-429
Our Price: $737.25
Trailer Brakes
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23-428-429 - 7200 lbs Axle Dexter Electric Drum Brakes
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If your trailer sees off-road action, use a handbrake (not included) with these brakes to hold it steady when parking on uneven terrain. Set of 12-1/4" x 2-1/2" Assemblies fits 16" wheels or larger. Made in the USA. Great Prices for the best trailer brakes from Dexter. Dexter Electric Trailer Brakes - Parking Brake Ready - 12-1/4" - Left/Right Hand - 7.2K part number 23-428-429 can be ordered online at or call 1-800-940-8924 for expert service.
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Dexter Trailer Brakes - 23-428-429

  • 7200 lbs Axle
  • Electric Drum Brakes
  • 12-1/4 x 2-1/2 Inch Drum
  • Standard Grade
  • 16 Inch Wheel
  • 16-1/2 Inch Wheel
  • 17 Inch Wheel
  • 17-1/2 Inch Wheel
  • Manual Adjust
  • Dexter

If your trailer sees off-road action, use a handbrake (not included) with these brakes to hold it steady when parking on uneven terrain. Set of 12-1/4" x 2-1/2" Assemblies fits 16" wheels or larger. Made in the USA.


  • Parking-brake-ready brakes let you park your trailer more safely
    • Perfect for pop-up campers, overlanding, and agricultural applications
    • Requires tongue-mounted activating lever and cables (not included)
  • Easier to install and gives you more control than hydraulic brakes
    • Requires only an electric brake controller (sold separately) - no actuator or hydraulic lines needed
  • Periodic manual adjustment required
    • Can be done in minutes
  • Long-lasting brake pads offer excellent braking torque
    • Fully bonded to shoes for more consistent braking compared to riveted pads
    • Tapered edges help minimize stuttering and brake lockup
  • Adjuster plugs (included) protect internal components from dirt, grime, and road debris
  • Left-hand (driver's-side) and right-hand (passenger's-side) brake assemblies included
  • Made in the USA


  • Application: most standard hub-and-drum assemblies, including etrailer, Dexter, and Lippert (LCI)
  • Dimensions: 12-1/4" diameter x 2-1/2" wide
  • Mounting flange bolt pattern: 4 bolt
  • Wheel size: 16" or larger
  • Axle rating: 7,200 lbs
  • Limited 5-year warranty

Quick Tip: There's really not a whole lot to getting new drum brakes. If you've confirmed that all of the specs listed above line up with what you need for your trailer, you can be pretty sure these will work for you.

Ready to Roll When You Are

If you're looking to customize your off-road trailer or pop-up camper, these brakes can be a great way to do that.

a greyscale diagram shows how a manual parking brake cable is installed on the back of an electric parking brake assembly

Installing these brakes is easy, and using them is even easier. Run the linkage cable from your tongue-mounted handbrake (not included) to the lever on the backing plate of the assembly as shown above. Then, just pull on the handbrake any time you need a little reassurance that your valuable cargo won't roll away from you.

High-Quality Brake Pads

Riveted brake pads will always give you a screeching reminder to replace your brake shoes. That's because the rivets will scrape against your drum as the friction material wears down. You won't have that noisy problem with bonded brake pads. You'll also get a little more friction pad contact because there aren't any cutouts for rivets. And more friction means more stopping power.

A close-up shot of a drum brake shows a tapered brake pad.

These pads are also tapered, which should help to prevent any broken, crumbly bits of material from rotating inside the drum as the pads wear over time. Brakes without these tapers are more likely to create a jarring braking experience that could cause the brakes to stutter and lock up.

How to Manually Adjust Trailer Brakes

The more miles you put on your trailer, the more your brake pads will wear down. As they lose contact with the drum, stopping distances get longer and longer. To keep your brakes working great, it's important to adjust them pretty routinely. For this job, grab a floor jack and either a brake adjustment tool (sold separately) or just a standard flathead screwdriver.

Jack up your trailer enough to get the wheel(s) off the ground. Remove the adjuster plugs from the backing plate on the brake, and insert the flat end of the tool through the back of the assembly.

Screenshot from an instruction video shows how to manually adjust the the alignment on a drum brake

Push in on the star gear and lift it up. Keep doing this until the brake pads catch on your drum. When you can't spin your wheel by hand anymore, back the gear off by about 10 clicks by pushing down on the star gear. Does the wheel now spin freely (even if it sounds like the brake pads drag slightly on the drum)? Great! Then you're all done with that one and ready to adjust the rest.

How to Break In New Brakes

After you get these brakes installed and adjusted, you'll need to break them in. First, find a long stretch of road or a big, empty parking lot. Once you're there, set your brake controller to its maximum setting and get moving. Speed up to about 40 mph and brake to slow to about 20 mph. Repeat this 15-30 times. The goal is to get the brake shoes and magnet properly seated into your drum. You'll know you've done that when it feels less jerky (and more consistent) each time you apply the brakes.

Note: The brakes will be very hot after doing this, so after every 10 stops you'll want to wait about 10 minutes to let the brakes cool off before continuing. If you don't, you might cook and crack the pad material.

23-428 Dexter Electric Brake Assembly - LH - Driver Side - 12-1/4" x 2-1/2" - 4 Bolt - Manual Adjust - 7,200 lbs

23-429 Dexter Electric Brake Assembly - RH - Passenger Side - 12-1/4" x 2-1/2" - 4 Bolt - Manual Adjust - 7,200 lbs

Customer Satisfaction Score:

Customer Reviews

Dexter Electric Trailer Brakes - Parking Brake Ready - 12-1/4" - Left/Right Hand - 7.2K - 23-428-429

Average Customer Rating:  4.8 out of 5 stars   (19 Customer Reviews)

If your trailer sees off-road action, use a handbrake (not included) with these brakes to hold it steady when parking on uneven terrain. Set of 12-1/4" x 2-1/2" Assemblies fits 16" wheels or larger. Made in the USA.


First order was incorrect but they went above to get my order here as fast as they could. Great service will be order again from them!!


My salesman very knowledgeable help me with some questions.
Easy to understand and pleasant.
I bought two axles worth of electric brakes. They are exactly the right fit easy to install. I will definitely use them again for further needs.


Excellent customer service I had issues with the box the hub was in and they shipped out missing part right away


Everything went easy ,and brake backing plates where exactly what I ordered an delivered on time


It makes the trailer stop


Ordering was easy. Brakes arrived promptly.very well packaged.


Parts look good, have not installed them yet















See what our Experts say about this Dexter Trailer Brakes

  • Replacement Hub and Drums For PJT Trailer With 008-393-03 Installed
    Thanks for all of the information on your PJT Trailer! Based on your drum part number you have a 12-1/4" Drum that is oil bath. The Dexter # 8-393-4UC3 is almost right, but it is designed for grease and not oil. You will need the # 8-393-4UC3 and oil seal # 10-63 for each hub. This hub does not include the bearings so you will also need new inner bearing # 25580 and outer bearing # 02475 for each hub. If you need replacement brakes now or in the future you will need # 23-428-429 for...
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  • Trailer Brakes Compatible with 12x2 inch or 12-1/4x2-1/2 Inch Hubs
    We have a fit for 12x2 inch hubs or 12-1/4x2-1/2 inch hubs. The Dexter Electric Trailer Brake Kit - 12-1/4" - Left and Right Hand Assemblies - 7,200 lbs # 23-428-429 is the only fit we have for the larger hubs and it has a 4 bolt versus 5 bolt brake flange connection, but we have both electric or hydraulic options for the 12x2 inch hubs. I've linked the page to all those options.
    view full answer...
  • Mounting Bolt Pattern and Center Hole Diameter For Dexter Trailer Brake Assemblies 23-248 and 23-429
    The Dexter Electric Trailer Brake Assembly # 23-429 & # 23-428 have a center opening of 3-7/8" for fitting on the axle tube. It will mount to bolt holes that are 3-5/8" spread left to right and 4-3/8" top to bottom. I have included images below with both measurements to help you identify the fitment. We also have them as a Set # 23-428-429 since you will will being replacing them on multiple axles. If these will not fit your current axles please let me know your mounting pattern and the...
    view full answer...
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  • Dexter Replacement Brake Assemblies that are 12-1/4 inch by 2-1/2 inch
    That's an 8k rated Dexter brake assembly for the right hand side of the trailer which we offer with the part # DX52QR for just the one assembly or part # 23-428-429 for both the right and left side.
    view full answer...
  • Mounting Bolt Pattern for Dexter 12-1/4 x 2-1/2-Inch Electric Drum Brake Assemblies
    All of our 12-1/4 x 2-1/2-inch brake assemblies use a 4-bolt mount. These appear on the linked page. We have none with a 9-bolt flange mounting pattern. I did check with several of our install and technical staff and I learned that some brake assemblies will use a backing plate that has extra holes, holes not intended for mounting purposes.
    view full answer...
  • Is The Distance Between Races On Dexter Hub 8-285-11 and 8-393-6UC3-A The Same?
    I had our warehouse measure the distance between the inner and outer races of the Dexter Trailer Hub and Drum # 8-285-11 and # 8-393-6UC3-A and they found that both of them have the exact same 1-3/4" measurement, so as long as you have the # 25580 inner bearing and # 02475 outer bearing combination either hub will fit fine. You will just need to match the hub to the correct brake assemblies as the # 8-285-11 uses 12-1/4" x 3-3/8" brake assemblies # 23-434-435 where the # 8-393-6UC3-A uses...
    view full answer...
  • Mounting Hole Pattern for Dexter 12 x 2 Electric Drum Brake 23-105-09
    Most of our 12 x 2 electric drum brake assemblies like Dexter left/right kit # 23-112-113 use a 5-bolt mounting pattern but the Dexter brake kit # 23-105-106-09 has both 4-bolt and 5-bolt mounting holes. I went to our warehouse and measured the spacing of the 4 bolt holes. You can see this center-to-center hole spacing in the photo I prepared for you. Please note that we do have a brake in a similar size, 12-1/4 x 2-1/2, for a 7200-lb axle that uses a 4-bolt pattern. This is brake set...
    view full answer...
    Image 1 for Image 2 for
  • What Trailer Brakes Do I Need For My Gatormade Aardvark Trailer
    The brakes that you will need for your Gatormade Aardvark is the Dexter Electric Trailer Brake Kit - 12-1/4" - Left and Right Hand Assemblies - 7,200 lbs, part # 23-428-429. I have included a product description link and a video demo link below.
    view full answer...
  • Dexter 7,200 Pound Axle Hub and Drum Assembly with 5/8 Inch Wheel Studs
    We have Dexter 8 on 6-1/2 Hub-and-Drum Assembly for 7,200-lb Axle - 9-Bolt and Newer 4-Bolt Brake Flange Item # 8-393-6UC3-A. It uses inner bearing 25580 and outer bearing 02475. This hub is compatible with 12-1/4 by 2-1/2 inch brakes # 23-428-429 which have a 4-bolt mounting pattern.
    view full answer...
  • Electric Trailer Brakes for 6,000 lb or 7,200 lb Axle
    The only way to know for sure what the capacity is of your axle is to contact the manufacturer with the serial number, but since you said they are 3 inch round axles, you are correct they will almost certainly be either 6,000 lb, 7,000 lb, or 7,200 lb axles. We can actually get you set up with new electric brakes based on the size of your hub and drum. You just need to measure the inside diameter and depth of your drum, as well as know the brake flange mounting bolt pattern to be sure....
    view full answer...
  • Is Dexter Electric Trailer Brake Kit for 7,200 lb Axles for One Axle or Two
    The Dexter Electric Trailer Brake Assembly - 12-1/4" - Left Hand # 23-428 is just one left hand brake assembly; the other side is the Dexter Electric Trailer Brake Assembly - 12-1/4" - Right Hand # 23-429. That is for one axle, and you can order them as a unit with the Dexter Electric Trailer Brake Kit - 12-1/4" - Left and Right Hand Assemblies - 7,200 lbs # 23-428-429. For an adjustment spoon you will need the Brake Adjustment Spoon for Drum Brakes # W80630, and the correct mounting...
    view full answer...
  • Testing and Replacing Brakes on a 2012 Carriage Cameo Trailer
    I've attached an article to help you test the magnets. You also should inspect the wiring for the brake that's giving you issues. If you need to replace the brake you don't have to do both. However, it might be easier in the long run and if the others are showing wear it's a good idea. It can save you time and money later. To determine which brakes to get you can measure the inside diameter of your drums. If they're 12 inch drums then I recommend using # AKEBRK-7-SA. These are self-adjusting...
    view full answer...
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Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Jeff D
Installed by:
Jeff D
Employee Adam R
Expert Research:
Adam R
Employee Wilson B
Updated by:
Wilson B
Employee Alexander C
Written by:
Alexander C
Employee Ryan F
Written by:
Ryan F

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